Title 



Yukawa particles confined in a channel and subject to a periodic potential : ground state and normal modes
 
Author 



 
Abstract 



We consider a classical system of twodimensional (2D) charged particles, interacting through a repulsive Yukawa potential exp(r/λ)/r, and confined in a parabolic channel that limits the motion of the particles in the y direction. Along the x direction, the particles are subject to a periodic potential. The groundstate configurations and the normalmode spectra of the system are obtained as a function of the periodicity and strength of the periodic potential (V0) and density. An interesting set of tunable groundstate configurations are found, with first or secondorder structural transitions between them. A configuration with particles aligned, perpendicular to the x direction, in each minimum of the periodic potential is obtained for V0 larger than some critical value that has a powerlaw dependence on the density. The phonon spectrum of different configurations was also calculated. A localization of the modes into a small frequency interval is observed for sufficiently large strength of the periodic potential, and a tunable gap in the phonon spectrum is found as a function of V0.   
Language 



English
 
Source (journal) 



Physical review : B : condensed matter and materials physics.  Lancaster, Pa, 1998  2015  
Publication 



Lancaster, Pa : 2011
 
ISSN 



10980121 [print]
1550235X [online]
 
Volume/pages 



83:9(2011), p. 094109,1094109,12
 
Article Reference 



094109
 
ISI 



000288119700001
 
Medium 



Eonly publicatie
 
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